
XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
PRELIMINARY
REV. P1.0.1
18
TRANSMIT LINE INTERFACE
S
IGNAL
N
AME
P
IN
#
T
YPE
D
ESCRIPTION
TTIP
8
O
Transmit Positive Analog Output
TTIP is the positive differential output to the line interface. Along with the
TRING signal, these pins should be coupled to a 1:2 step up transformer for
proper operation. This pin should have a series line capacitor of 0.68
μ
F.
TRING
6
O
Transmit Negative Analog Output
TRING is the negative differential output to the line interface. Along with the
TTIP signal, these pins should be coupled to a 1:2 step up transformer for
proper operation.
TxON
128
I
Transmitter On
Upon power up, the transmit output (TTIP/TRING) is tri-stated. Turning the
transmitter On or Off is selected by programming the appropriate register if this
pin is pulled “High”. If the TxON pin is pulled “Low”, the transmitter is tri-stated.
N
OTE
:
Internally pulled “Low” with a 50k
resistor.
TIMING INTERFACE
S
IGNAL
N
AME
P
IN
#
T
YPE
D
ESCRIPTION
MCLKIN
24
I
Master Clock Input:
This pin is used to provide the timing reference for the internal master clock of
the device. The frequency of this clock is programmable from 8kHz to
16.384MHz in register 0x0FE9.
MCLKnOUT
25
O
LIU T1/E1 Output Clock Reference
This output clock depends on the mode of operation. In T1 mode, this output
pin is defaulted to 1.544MHz, but can be programmed to output 3.088MHz,
6.176MHz, or 12.352MHz in register 0x0FE4. In E1 mode, this output pin is
defaulted to 2.048MHz, but can be programmed to 4.096MHz, 8.192MHz, or
16.384MHz in register 0x0FE4.
OSCCLK
86
O
Framer T1/E1 Output Clock Reference
This output clock depends on the mode of operation. In T1 mode, this output
pin is defaulted to 1.544MHz, but can be programmed to output 49.408MHz in
register 0x011E. In E1 mode, this output pin is defaulted to 2.048MHz, but can
be programmed to 65.536MHz in register 0x011E.
8KSYNC
88
O
8kHz Clock Output Reference
This pin is an output reference of 8kHz based on the MCLKIN input. Therefore,
the duty cycle of this output is determined by the time period of the input clock
reference.
8KEXTOSC
122
I
External Oscillator Select
For normal operation, this pin should not be used, or pulled “Low”.
N
OTE
:
This pin is internally pulled “Low” with a 50k
resistor.
ANALOG
19
O
Factory Test Mode Pin
Note:
For Internal Use Only
LOP
1
I
Loss of Power for E1 Only / Input Pin for Messaging